12=20-4b

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Solution for 12=20-4b equation: 



12=20-4b

We move all terms to the left:

12-(20-4b)=0

We add all the numbers together, and all the variables

-(-4b+20)+12=0

We get rid of parentheses

4b-20+12=0

We add all the numbers together, and all the variables

4b-8=0

We move all terms containing b to the left, all other terms to the right

4b=8

b=8/4

b=2

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